Nah, not a fan of them myself, prefer just your standard dragon mounts personally, but it was a nice change up for the expansion I suppose.
Personally I want more smaller flying/ground mounts around the size of the updated Gryphon and Wyvern mounts they made. I don't know why but they just feel so much neater!

I think they're pretty horrible; perhaps the worst new mount so far after gryphons/wyverns. I always get a giggle out of the amount of people camping Houlon for hours and days and weeks just for the same mount as the shado-pan rep one with a little light streak on it.